One of Drew Peterson's former wives was found dead, another went missing, and yet the former police sergeant had steadfastly – some say brashly – maintained his innocence in the face of suspicions by police and the victims' families. But on Thursday, Peterson, 55, was arrested during a traffic stop in Bolingbrook, Ill., on charges of murdering one of those women, Kathleen Savio, his third wife, whose body was discovered in an empty bathtub in 2004.